Force-filter.



No. 802,105. PATENTED OCT. 17, 1905. J. JOHNSON & E. HOWELL.

FORGE FILTER.

APPLICATION FILED JAN. 16, 1905-,

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Wtncww gwuewtozs PATENTED 0CT.17, 1905. J. JOHNSON & E. HOWELL.

FORCE FILTER.

APPLIGATION FILED JAN. 18 1005.

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JOHN JOHNSON AND EDWARD HOWELL, OF BROOKLYN, NEW YORK,

ASSIGNORS TO JOHN JOHNSON COMPANY, A CORPORATION OF NEW YORK.

FORCE-FILTER.

Specification of Letters Patent.

Patented Oct. 17, 1905.

Application filed January 18, 1905. $erial No. 241,545.

T at whom zit rmty concern.-

Be it known that We, JOHN JOHNSON and ED- WARD HOWELL, citizens of the United States, residing at Brooklyn, New York, have invented certain new and useful Improvements in Force-Filters, of which the followingis a clear, full, and exact description.

Our invention relates to a filter in which the liquid is forced through the filtering media; and our object is to improve the construction of the same.

The filtering media such as the filteringcloths of force-filters after a time become clogged with material deposited thereon and have to be renewed or cleaned, and where the liquid to be filtered is of such a character that it has to be forced through the filtering media by a pump such, for example, as varnish the filtering-tank is still full of unfiltered liquid which must be removed before the filtering media can be manipulated.

One object of the invention is to provide a construction by which this unfiltered liquid may be easily and quickly drawn off and forced through the filtering media of an independent and preferably normally unused filtering-compartment.

The invention will be set forth in the claims.

In the preferred embodiment of the invention shown in the drawings, Figure 1 is an end elevation. Fig. 2 is a detail showing the stationaryw-alveports and in dotted lines the position of the ports in the rotatable valvehead during the normal operation of the filter. Fig. 3 is a similar view showing in dotted lines the position of ports in the head when draining the main tank. Fig. 4 is a section of the rocking valve-head, taken on line 4: 4 of Fig. 2. Fig. 5 is a partial section of the main tank on line m w of Fig. 1. Fig. 6 is a front elevation of one of the flush-plates, and Fig. 7 is a similar view of the one of the spacingframes located between each two flush-plates.

In the drawings, 1 is a storage-receptacle from which the liquid to be filtered is drawn by a pump 2 and forced into the main filteringtank, (designated generically by This tank may be of different constructions; but in the present embodimentit is made up of a plurality of compartments, as seen in Fig. 5, each of which is formed by two removable so-called flush-plates 4 4. and a spacing-frame 5. Between each face of a flush-plate and the adjacent spacing-frame is a filter-cloth 6, and

each face of the flush-plate may be cut, as shown in Figs. 5 and 6, by intersecting grooves to form pyramids 7 7 against which the filtering-cloth 6 is forced by the pressure, the grooves allowing the filtered liquid to run down to the bottom of the plate and be dis charged through openings 8 in a lower corner of each plate and a passage 9, formed by holes in each plate and frame. The liquid to be filtered may be forced by the pump into the main tank in different ways; but it is preferred to provide a passage which connects with each compartment of the tank at the lower portion of thesame, and this may, if desired, be formed by a series of registering holes 10 in the spacing-frames and flush-plates, holes 11 (see Fig. 7) in the frames allowing the liquid to enter the inside of each compartment that is, in this embodiment, the space between the two filter-cloths of any one compartment. The plates and frames are each provided with ears 12, which rest on guides 13 and 1 1, attached to the end pieces 43 and H of the press-frame. A follower 15 may force all the parts tightly together when screw 16 is turned, so as to make tight joints.

In the normal operation of the main tank the varnish is drawn by the pump through pipe 17 and passes into stationary port 18, Fig. 2, through port 19 in the rotatable valve-head 40, out of stationary port 20 and by pipe 21 to the intake side of the pump. From the discharge side of the pump pipe 39 leads to stationary port 22. and port 23 in the valve-head connects it with the feed-passage 10, leading to all the compartments of the main tank. The filtered varnish goes through discharge-passage 9 to the rocking valve-head, where port 24 in said head and stationary port 25 connect it to pipe 26, leading to any desired storage-tank. Other forms of valve devices for making the different connections desired may be employed; but the valve shown is an efiicient. means for accomplishing the desired results.

It will be observed that the main filteringtank is normally closed against egress of liquid except through the filter-cloths.

When the filtering media of the main tank havebecome clogged with deposited matter and I it is desired to clean or remove the same, the

unfiltered liquid in said tank may be withdrawn by merely throwing handle 27 on the valve-head upward one-eighth of a turn.

Port 19 will then (see Fig. 3) disconnect the discharge side of the pump from the main tank and connect the intake side thereof to the passage 10, which leads to the lower portion of the inside of the tank. We prefer to have the passage by which the liquid is fed to the tank lead to the lower portion of the tank, as shown, and to use this one connection for both feeding in and withdrawing the liquid; but this may not be necessary in all cases. Turning the valve-head will also close the discharge-passage 9 for the filtered liquid. 28 is an air-inlet communicating with all the compartments of the main tank by a passage 29, formed by holes 30 in the frames and plates and holes 31 in the frames and which is normally closed by a valve 32, which may be opened when the liquid is to be drawn out by the pump. The pump, therefore, constitutes a means for creating air-pressure within the main tank; but other means for creating a pressure on the unfiltered liquid may be used, if desired. The pump will then (see Fig. 3) draw out the unfiltered liquid in the main tank and force it into an additional and normally unused filtering-compartment. This independent compartment is normally unconnected with the main tank and preferably also normally unconnected with the pump and is also while it is in operation closed against egress of liquid except through its filtering media. In the embodiment of our invention illustrated this compartment 36 is formed between the recessed faces of two adjacent plates, preferably the end plate and the adjoining one, and also has over each face a filter-cloth 33.

34 is a passage leading to the stationary port 35 behind the valve-head, so that when the head is in the position shown in Fig. 3 port 23 connects the discharge side of the pump to the passage 34:. The valve and passages therefore then connect the main tank to the supplementary filtering-compartment 36 and the pump will cause a pressure within the main tank which will force the liquid out and force it into the compartment 36, through its cloths 33 and through holes 37 and dischargepassage 38 to port 24 in the valve-head, and so out into pipe 26, thus emptying the main tank and completely filtering all the unfiltered liquid remaining therein when the valve is rocked.

The valve-head 40 and the different stationary ports cooperating therewith obviously form a compound valve-that is, a plurality of valves acting simultaneously.

We are aware that many variations from the construction shown in the drawings may be made without departing from the scope of our invention as claimed, and we therefore do not desire to be limited to the particular embodiment described and illustrated.

What we claim is 1. In a force-filter in combination, a main filtering-tank, a supplementary filtering-compartment having a filter and normally unconnected with said main tank and in operative position adapted to be closed against egress of liquid except through said filter, means for withdrawing from said main tank unfiltered liquid therein and forcing the same into said supplementary compartment and through the filter therein.

2. In a force-filter in combination, a main filtering-tank having a filtering material and normally closed against egress of liquid except through said material, an independent filtering-compartment, normally unconnected with said tank, having a filtering material and also in operative position adapted to be closed against egress of liquid except through said material, means to connect the inside of said main tank to said independent compartment, and means to cause pressure within said main tank whereby the unfiltered liquid residue therein is forced into said independent compartinent and through the filtering material therein.

3. In a force-filter in combination, a main filtering-tank having a filtering material and normally closed against egress of liquid except through said material, an independent filtering-compartment, normally unconnected with said tank, having a filtering material and also in operative position adapted to be closed against egress of liquid except through said material, means to connect the inside of said main tank to said independent compartment, a normally closed air-inlet into said main tank and a valve to open the same, and a pump to cause pressure within said main tank whereby the unfiltered liquid residue therein is forced into said independent compartment and through the filtering material therein.

4:. In a force-filter in combination, a main filtering-tank having a filtering material and normally closed against egress of liquid except through said material, a discharge passage from said tank for the filtered liquid and a valve therein, an independent filtering-compartment, normally unconnected with said tank, having a filtering material and also in operative position adapted to be closed against egress of liquid except through said material, means to connect theinside of said main tank to said independent compartment, and means to cause pressure within said main tank whereby the unfiltered liquid rcsidue therein is forced into said independent compartment and through the filtering material therein.

5. In a force-filter in combination, a main filtering-tank having a filtering material and normally closed against egress of liquid except through said material, a discharge-passage from said tank for the filtered liquid and a valve therein, an independent filtering-compartment, normally unconnected with said tank, having a filtering material and also in operative position adapted to be closed against egress of liquid except through said material,

means to connect the lower portion of the inside of said main tank to said independent compartment, a normally closed air-inlet into said main tank and a valve to open the same, and means to cause pressure within said main tank whereby the unfiltered liquid residue egress of liquid except through said filter,

and mechanism adapted to change said feed connectionfrom the discharge side of said pump to the intake side and connect said discharge side to said supplementary compartment.

7. In a liquid-filter in combination, a main filtering-tank having filtering material and normally closed against egress of liquid except through said material, apump, and a feed connection to the lower portion of said tank from the discharge side of said pump whereby liquid may be forced thereby into said main tank and through said material, a supplementary compartment having a filter, and normally unconnected with said pump and main tank, and in operative position adapted to be closed against egress of liquid except through said filter, and mechanism adapted to change said feed connection from the discharge side of said pump to the intake side and connect said discharge side to said supplementary compartment.

8. In a liquid-filter in combination, a main filtering-tank having filtering material and normally'closed against egress of liquid except through said material, a pump, and a feed connection to said tank from the discharge side of said pump whereby liquid may be forced thereby into said main tank and through said material, a supplementary compartment having a filter, and normally unconnected with said pump and main tank, and in operative position adapted to be closed against egress of liquid except through said filter, a normally closed air-inlet into said main tank and a valve to open the same, and mechanism adapted to change said feed connection from the discharge side of said pump to the intake side and connect said discharge side to said supplementary compartment.

9. In a liquid-filter in combination, a main filtering-tank having a normally closed against egress of liquid except filtering material and through said material, a pump, and a feed connection to the lower portion of said tank from the discharge side of said pump whereby liquid may be forced thereby into said main tank and through said material, a supplementary compartment having a filter, and normally unconnected with said pump and main tank, and in operative position adapted to be closed against egress of liquid except through said filter, a normally closed air -inlet into said main tank and a valve to open the same, and mechanism adapted to change said feed connection from the discharge side of said pump to the intake side and connect said discharge side to said supplementary compartment.

10. In a force-filter in combination, a frame, a main filtering-tank composed of a plurality of filtering-compartmcnts made up of a series of separable plates sliding on a suitable guide, a supplementary filtering-compartment made up of separable parts and assembled in said frame with said main tank, said compartment having a filter, and normally unconnected with said main tank and in operative position adapted to be closed against egress of liquid except through said filter, and means for withdrawing from said main tank unfiltered liquid therein and forcing the same into said supplementary compartment and through the filter therein.

11. In a liquid-filter in combination,aframe, a main filtering-tank composed of a plurality of compartments and made up of a plurality of separable plates sliding upon a suitable guideway of said frame, each of said compartments having a filtering material therein and normally closed against egress of liquid except through said material, a pump, and a feed connection to the lower portion of each of the compartments of said tank from the discharge side of said pump whereby liquid may be forced thereby into said main tank and through said material therein, a supplementary compartment having a filter and normally unconnected with said pump and main tank, and in operative position adapted to be closed against egress of liquid except through said filter, a normally closed air-inlet into the compartments of said main tank and valve mechanism to open the same, said supplementary compartment being also made up of separable units assembled. in said frame with said main tank, and mechanism adapted to change said feed connection from the discharge side of said pump to the intake side and connect said discharge side to said supplementary compartment.

Signed at New York, N. Y., this Qath day of October, 1904.

JOHN JOHNSON. EDWARD HOWELL.

'W'itnesses:

EMERSON R. NEWELL, BEATRICE MIRvIs. 

